Nasal obstruction is a blockage of the nasal cavity, which is the space inside the nose. It may occur due to excess mucus or structural changes to the nose. The nasal cavity divides into two passages, ...

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When you're sick you'll often produce more phlegm, and might notice it's thicker or a different color: white, green, yellow or maybe even brown. We all produce mucus, even when healthy. Mucus is a ...

Mucus is a thin, slippery fluid that lines the nose, throat, and other passages to trap dust and germs. Phlegm is a thicker type of mucus produced in the lungs to catch and remove harmful particles ...